Sylvian Fissure Lipoma Associated with Middle Cerebral Artery Aneurysm – Report of a Rare Case Highlighting Imaging Pitfalls

Aim: We describe a 60 year old lady who had a Sylvian fissure lipoma associated with an underlying middle cerebral artery saccular aneurysm which is a rare association and describe its imaging features.

Presentation of Case: Due to its rarity and MRI appearances simulating blood products, this case offered an initial diagnostic dilemma to the reporting radiologists, when an incidental lesion like lipoma adjoining an aneurysm was initially misinterpreted as blood products.

Discussion and Conclusion: This case highlights potential pitfalls in imaging interpretation even with a newer neuroimaging technique to accurately identify the nature of the lesion that can lead to misdiagnosis with the potential of inappropriate clinical management, at least in some cases.